What was found
SHIP 3358 CLIMBING THROUGH FL300, ECAM MESSAGE DOOR R AFT CABIN ANNUCIATED. DOOR 4R SHOWED OPEN ON ECAM DOOR PAGE + FWD FAP. C/W ECAM + QRH PG. 15. CABIN ALT + V/S SHOWED NORMAL. CORRECTIVE ACTION: VERIFIED ADJUSTMENT OF PROX SENSORS 22MJ AND 24MJ WITH A/C PRESSURIZED AND UN-PRESSURIZED. NO DEFETS NOTED. PERFORMED ADJUSTMENT OF 4R DOOR LOCKING MECHANISM. WIRE CHECK FROM PROX 22MJ / 24MJ TO PSCU 5MJ. FOUND FLUCUATING RESISTANCE 0 TO 208 KOHMS BETWEEN 24MJA, 22MJA TO 5MJAA. 5MJAA TO 3708VCA READS 0.2 OHMS. 3708VC TO 5170VC PINS 9/10 TO A/B READS FLUCATING RESISTANCE OF 0-208 KOHM. DEPINNED AND REPINNED CONTACTS IN 3708VC 9, 10,11, & 12. RESEATED CONNECTOR. PSCU 5MJAA TO PROX SW 22MJ & 24MJ NOW READ STEADY 5.4 OHMS. ON ALL CONTACTS. 4R DOOR INDICATION OPERATES NORMAL. REPLACED PSCU (5MJ). PERFORMED BITE TEST OF PSCU. (4741984)